Recorder and reproducer.



PATENTED 1130. 17, 1907.

T. H. MACDONALD. I REGORDER AND REPRODUGBE;

APPLICATION FILED APB.8.1907.

wimemco "UNITED STATES PATENT O FI E.

- THOMAS MACDONALD, OF-BRIDGEPORI, CONNECTICUT, ASSIGNOR To AM RICAN GRAPHOPHONE COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF WEST VIRGINIA.

- RECORDER AND REPBODUCER.

its Object to improve the construction of the same, and more particularly the construction of the sound box with relation to the diaphragm, and the connection of the sound tube to the sound box. With this object in view the invention consists of a circular sound box whose walls support the diaphragmfthe crown or top of the box being dished. or concave with itscenter very close to the diaphragm and its periphery, where it joins the walls, many times farther removed from the diaphragm, so that at the outer edge the air space in the sound boxv is many times greater than in the center. This is accomplished by placing the dished crown of the sound. box with its convex side towards the diaphragm and its concave side on the .exterior of the box. The sound tube is connected to the concave side of the sound box crown by a balland socket joint, the socket 130 being preferably struck up integrally with the metal-Of the crown, and the ball of the joint beingformed integral with the sound conveying tube.

WVithin limits the inventive idea may be embodied in a variety of structures, and for the purpose ofillustration' there is shown in the accompanying drawings a recorder which embodies the invention, in which drawings Figure 1 is a transverse vertical section of 40 a recorder witli the recording style in place upona record. tablet; and Fig. 2 is a bottom plan view of the same.

Referring to the drawings, 1 is the dia phragm andv 2 is the sound box supporting the same at its periphery in. the usual or any suitable way. From. the diaphragm the walls of the sound box rise to a considerable distance, as shown, and from said walls the crown or top 3 of the box is dished or concaved inwards so that at its center it is very close to the diaphragm, preferably about 1 100th of an inch therefrom. The crown is provided with a central opening 4, and rising from around this opening is a spherically formed socket '5 within which loosely rests Specification of Letters Patent.

I Application filed April 8, 1907. Serial No. 367.097.

nvention relates to recorders and Patented Doc. 17,

the spherically formed end 6 of the sound tube 7 which is provided with a flange 8 at its upper end, fitting closely butlooselywithin the neck 9 of the frame 10 to which the usual or any suitable sound conveying element, as a horn, may be attached.

It Will be understood that the diaphragm carries a recording or reproducing style, here shown as a recording style 11, and that the i I sound box is pivoted at 12 to the frame 10. Preferably the entire sound box and the socket 5 are struck up from asingle piece of sheet metal, while the ball 6 and the other portions of the sound tube are also struck up from a single piece of metal, forming a light, cheap and efficient structure. 1

What is claimed is:

' 1. In a recorder or reproducer, a sound box with a dishe'd or concave crown and a diaphragm supported with its central portion in close proximity to the central portion of said. crown and its periphery relatively far removed from said crown.

2. In a recorder or reproducer, a sound box having an inwardly dished crown, and adiaphragni supported by the side walls of said sound box with the central portion of the diaphragm. in close proximity to the central portion of said crown and the periphery thereof relatively far removed from said Crown.

3. In a recorder or reproducer, a sound box having side walls and an inwardly dished crown or top with an opening at or near its center, a sound tube joined to said crown or top around said Opening, and a diaphragm supported by the side walls of said sound box with its central portion in close proximity to the inner side of said dished crown and its from said crown. I

4. In a recorder or reproducer, a sound box having side walls and an inwardly dished crown or top with an openir'i at or near its center, a sound tube joined to said. crown by a ball and socket joint surrounding said open ing, and a diaphragm supported. by the side walls of said sound box with its central portion in close proximity to the inner side of said dished crown at said Opening and its peripheral portion relatively far removed from said crown.

5. In a recorder or reproducer, a sound box and a diaphragm supported by said sound box, the crown or top of the said box having a convex inner surface with an opening peripheral portion relatively far removed i throu 'h its central portion, the central portion o t the crown belng in close proximity to said dia hragrn and retreating farther and farther rom the diaphragm as it approaches 5 the-side walls of the box,

6. In a recorder or reproducer, a sound box struck from a single piece of sheet metal and having side walls, an inwardly dished crown and a spherically formed socket which latter 10 surrounds a central opening in said crown, a

dia hragm supportedwith its central portion in 'c ose proximity to the said central opening moved and its eripheral portion relatively far rf iom said crown, and a sound tube having a spherical portion fitting into said socket.

In testimony whereof I'have signed this specification in the presence of two subscribing witnesses.

THOMAS H I MACDONALD.

Witnesses:

A. B. KEOUGH, C. A.'GIBNER. 

